The Khmer people were among the first in Southeast Asia to adopt religious ideas and political institutions from India and to establish centralized kingdoms encompassing large territories. The earliest known kingdom in the area, Funan, flourished from around the first to the sixth century A.D. It was succeeded by Chenla, which controlled large areas of modern Cambodia, Vietnam, Laos, and Thailand. The golden age of Khmer civilization, however, was the period from the ninth to the thirteenth century, when the kingdom of Kambuja, which gave Kampuchea, or Cambodia, its name, ruled large territories from its capital in the region of Angkor in western Cambodia.

Under Jayavarman VII (1181-ca. 1218), Kambuja reached its zenith of political power and cultural creativity. Following Jayavarman VII's death, Kambuja experienced gradual decline. Important factors were the aggressiveness of neighboring peoples (especially the Thai, or Siamese), chronic interdynastic strife, and the gradual deterioration of the complex irrigation system that had ensured rice surpluses. The Angkorian monarchy survived until 1431, when the Thai captured Angkor Thom and the Cambodian king fled to the southern part of his country.

The fifteenth to the nineteenth century was a period of continued decline and territorial loss. Cambodia enjoyed a brief period of prosperity during the sixteenth century because its kings, who built their capitals in the region southeast of the Tonle Sap along the Mekong River, promoted trade with other parts of Asia. This was the period when Spanish and Portuguese adventurers and missionaries first visited the country. But the Thai conquest of the new capital at Lovek in 1594 marked a downturn in the country's fortunes and Cambodia became a pawn in power struggles between its two increasingly powerful neighbors, Siam and Vietnam. Vietnam's settlement of the Mekong Delta led to its annexation of that area at the end of the seventeenth century. Cambodia thereby lost some of its richest territory and was cut off from the sea. Such foreign encroachments continued through the first half of the nineteenth century because Vietnam was determined to absorb Khmer land and to force the inhabitants to accept Vietnamese culture.

In 1863 King Norodom signed an agreement with the French to establish a protectorate over his kingdom. The country gradually came under French colonial domination. During World War II, the Japanese allowed the French government (based at Vichy) that collaborated with the Nazis to continue administering Cambodia and the other Indochinese territories, but they also fostered Khmer nationalism. Cambodia enjoyed a brief period of independence in 1945 before Allied troops restored French control. King Norodom Sihanouk, who had been chosen by France to succeed King Monivong in 1941, rapidly assumed a central political role as he sought to neutralize leftist and republican opponents and attempted to negotiate acceptable terms for independence from the French. Sihanouk's "royal crusade for independence" resulted in grudging French acquiescence to his demands for a transfer of sovereignty. A partial agreement was struck in October 1953. Sihanouk then declared that independence had been achieved and returned in triumph to Phnom Penh.

As a result of the Geneva Conference on Indochina, Cambodia was able to bring about the withdrawal of the Viet Minh troops from its territory and to withstand any residual impingement upon its sovereignty by external powers.

Neutrality was the central element of Cambodian foreign policy during the 1950s and 1960s. By the mid-1960s, parts of Cambodia's eastern provinces were serving as bases for North Vietnamese Army and Viet Cong (NVA/VC) forces operating against South Vietnam, and the port of Sihanoukville was being used to supply them. As NVA/VC activity grew, the United States and South Vietnam became concerned, and in 1969, the United States began a fourteen month long series of bombing raids targeted at NVA/VC elements, killing an estimated 600,000 civilians, contributing significantly to destabilization both politically and economically.

Throughout the 1960s, domestic politics polarized. Opposition grew within the middle class and among leftists including Paris-educated leaders such as Son Sen, Ieng Sary, and Saloth Sar (later known as Pol Pot), who led an insurgency under the clandestine Communist Party of Kampuchea (CPK). Sihanouk called these insurgents the Khmer Rouge, literally the "Red Khmer." But the 1966 national assembly elections showed a significant swing to the right, and Gen. Lon Nol formed a new government, which lasted until 1967. During 1968 and 1969, the insurgency worsened. In August 1969, Gen. Lon Nol formed a new government. Prince Sihanouk went abroad for medical treatment in January 1970.

In March 1970, Gen. Lon Nol deposed Prince Sihanouk and assumed power. Son Ngoc Thanh announced his support for the new government. On October 9, the Cambodian monarchy was abolished, and the country was renamed the Khmer Republic.

Hanoi rejected the new republic's request for the withdrawal of NVA/VC troops and began to reinfiltrate some of the 2,000-4,000 Cambodians who had gone to North Vietnam in 1954. They became a cadre in the insurgency.

The United States moved to provide material assistance to the new government's armed forces, which were engaged against both the Khmer Rouge insurgents and NVA/VC forces. In April 1970, US and South Vietnamese forces entered Cambodia in a campaign aimed at destroying NVA/VC base areas. Although a considerable quantity of equipment was seized or destroyed, NVA/VC forces proved elusive and moved deeper into Cambodia. NVA/VC units overran many Cambodian army positions while the Khmer Rouge expanded their small-scale attacks on lines of communication.

The Khmer Republic's leadership was plagued by disunity among its three principal figures: Lon Nol, Sihanouk's cousin Sirik Matak, and National Assembly leader In Tam. Lon Nol remained in power in part because none of the others was prepared to take his place. In 1972, a constitution was adopted, a parliament elected, and Lon Nol became president. But disunity, the problems of transforming a 30,000-man army into a national combat force of more than 200,000 men, and spreading corruption weakened the civilian administration and army.

The insurgency continued to grow, with supplies and military support provided by North Vietnam. But inside Cambodia, Pol Pot and Ieng Sary asserted their dominance over the Vietnamese-trained communists, many of whom were purged. At the same time, the Khmer Rouge forces became stronger and more independent of their Vietnamese patrons. By 1973, the Khmer Rouge were fighting major battles against government forces on their own, and they controlled nearly 60% of Cambodia's territory and 25% of its population.

The government made three unsuccessful attempts to enter into negotiations with the insurgents, but by 1974, the Khmer Rouge were operating as divisions, and virtually all NVA/VC combat forces had moved into South Vietnam. Lon Nol's control was reduced to small enclaves around the cities and main transportation routes. More than 2 million refugees from the war lived in Phnom Penh and other cities.

On New Year's Day 1975, Communist troops launched an offensive which, in 117 days of the hardest fighting of the war, destroyed the Khmer Republic. Simultaneous attacks around the perimeter of Phnom Penh pinned down Republican forces, while other Khmer Rouge units overran fire bases controlling the vital lower Mekong resupply route. A US-funded airlift of ammunition and rice ended when Congress refused additional aid for Cambodia. Phnom Penh and other cities were subjected to daily rocket attacks causing thousands of civilian casualties. Phnom Penh surrendered on April 17--5 days after the US mission evacuated Cambodia.

Many Cambodians welcomed the arrival of peace, but the Khmer Rouge soon turned Cambodia--which it called Democratic Kampuchea (DK)--into a land of horror. Immediately after its victory, the new regime ordered the evacuation of all cities and towns, sending the entire urban population out into the countryside to till the land. Thousands starved or died of disease during the evacuation. Many of those forced to evacuate the cities were resettled in new villages, which lacked food, agricultural implements, and medical care. Many starved before the first harvest, and hunger and malnutrition--bordering on starvation--were constant during those years. Those who resisted or who questioned orders were immediately executed, as were most military and civilian leaders of the former regime who failed to disguise their pasts.

Within the CPK, the Paris-educated leadership--Pol Pot, Ieng Sary, Nuon Chea, and Son Sen--was in control. A new constitution in January 1976 established Democratic Kampuchea as a Communist People's Republic, and a 250-member Assembly of the Representatives of the People of Kampuchea (PRA) was selected in March to choose the collective leadership of a State Presidium, the chairman of which became the head of state.

Prince Sihanouk resigned as head of state on April 4. On April 14, after its first session, the PRA announced that Khieu Samphan would chair the State Presidium for a 5-year term. It also picked a 15-member cabinet headed by Pol Pot as prime minister. Prince Sihanouk was put under virtual house arrest.

The new government sought to restructure Cambodian society completely. Remnants of the old society were abolished and Buddhism suppressed. Agriculture was collectivized, and the surviving part of the industrial base was abandoned or placed under state control. Cambodia had neither a currency nor a banking system. The regime controlled every aspect of life and reduced everyone to the level of abject obedience through terror. Torture centers were established, and detailed records were kept of the thousands murdered there. Public executions of those considered unreliable or with links to the previous government were common. Few succeeded in escaping the military patrols and fleeing the country.

Solid estimates of the numbers who died between 1975 and 1979 are not available, but it is likely that hundreds of thousands were brutally executed by the regime. Hundreds of thousands more died of starvation and disease (both under the Khmer Rouge and during the Vietnamese invasion in 1978). Estimates of the dead range from 1 to 3 million, out of a 1975 population estimated at 7.3 million.

Democratic Kampuchea's relations with Vietnam and Thailand worsened rapidly as a result of border clashes and ideological differences. While communist, the CPK was fiercely anti-Vietnamese, and most of its members who had lived in Vietnam were purged. Democratic Kampuchea established close ties with the People's Republic of China, and the Cambodian-Vietnamese conflict became part of the Sino-Soviet rivalry, with Moscow backing Vietnam. Border clashes worsened when Democratic Kampuchea's military attacked villages in Vietnam. The regime broke relations with Hanoi in December 1977, protesting Vietnam's attempt to create an Indochina Federation. In mid-1978, Vietnamese forces invaded Cambodia, advancing about 30 miles before the arrival of the rainy season.

In December 1978, Vietnam announced formation of the Kampuchean United Front for National Salvation (KUFNS) under Heng Samrin, a former DK division commander. It was composed of Khmer Communists who had remained in Vietnam after 1975 and officials from the eastern sector--like Heng Samrin and Hun Sen--who had fled to Vietnam from Cambodia in 1978. In late December 1978, Vietnamese forces launched a full invasion of Cambodia, capturing Phnom Penh on January 7 and driving the remnants of Democratic Kampuchea's army westward toward Thailand.

UN-sponsored elections in 1993 helped restore some semblance of normalcy as did the rapid diminishment of the Khmer Rouge in the mid-1990s. Norodom Sihanouk was reinstated as King. A coalition government, formed after national elections in 1998, brought renewed political stability and the surrender of remaining Khmer Rouge forces in 1998.

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